design/sys/iop/niu/rtl/niu_pio_imask1_decoder.v

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// OpenSPARC T2 Processor File: niu_pio_imask1_decoder.v
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/*%W%   %G%*/

/*****************************************************************
 *
 * File Name    : niu_pio_imask1_decoder.v
 * Author Name  : John Lo
 * Description  : It contains ldf_mask 64~68 read/write decoder,
 *
 * Parent Module: niu_pio_imask1_decoder.v
 * Child  Module:
 * Interface Mod: many.
 * Date Created : 3/30/04
 *
 * Copyright (c) 2020, Sun Microsystems, Inc.
 * Sun Proprietary and Confidential
 *
 * Modification :
 *
 ****************************************************************/

module niu_pio_imask1_decoder (/*AUTOARG*/
   // Outputs
   imask1_ack, imask1_rdata, imask1_err, ld_ldf_mask64,
   ld_ldf_mask65, ld_ldf_mask66, ld_ldf_mask67, ld_ldf_mask68,
   // Inputs
   clk, reset, imask1_sel_reg, addr, rd, ldf_mask64,
   ldf_mask65, ldf_mask66, ldf_mask67, ldf_mask68
   );
   input                      clk;
   input                      reset;
   input                      imask1_sel_reg;
                              // pio broadcast signals
   input [18:0]               addr;
   input                      rd;
   input [1:0]                ldf_mask64;
   input [1:0]                ldf_mask65;
   input [1:0]                ldf_mask66;
   input [1:0]                ldf_mask67;
   input [1:0]                ldf_mask68;

   output                     imask1_ack;
   output [63:0]              imask1_rdata;
   output                     imask1_err;

   output                     ld_ldf_mask64;
   output                     ld_ldf_mask65;
   output                     ld_ldf_mask66;
   output                     ld_ldf_mask67;
   output                     ld_ldf_mask68;

// common reg declaration
   reg [63:0]                 rd_data;
   reg                        non_qualified_addr_err;
// common wrie declaration
   wire [63:0]                imask1_rdata;
   wire                       rd_en;
   wire                       wr_en;
   wire                       rasr;
// output reg declaration
   reg                        ld_ldf_mask64;
   reg                        ld_ldf_mask65;
   reg                        ld_ldf_mask66;
   reg                        ld_ldf_mask67;
   reg                        ld_ldf_mask68;

`ifdef NEPTUNE
/* ---------------------------------------------------------- */
   reg                          imask1_sel_reg_int;
   reg                          rd_int;
   reg [18:0]                   addr_int;

always @(posedge clk)
 if (reset)
  begin
   imask1_sel_reg_int   <= 1'b0;
   rd_int               <= 1'b0;
   addr_int             <= 19'b0;
  end
 else
  begin
   imask1_sel_reg_int   <= imask1_sel_reg ;
   rd_int               <= rd ;
   addr_int             <= addr;
  end

`else
/* ---------------------------------------------------------- */

   wire                         imask1_sel_reg_int;
   wire                         rd_int;
   wire [18:0]                  addr_int;

   assign imask1_sel_reg_int    = imask1_sel_reg ;
   assign rd_int                = rd ;
   assign addr_int              = addr ;
/* ----------------------------------------------------------- */
`endif


niu_rw_ctl imask1_rw_ctl(
                      // Outputs
                      .wr_en            (wr_en),
                      .rd_en            (rd_en),
                      .ack              (imask1_ack),
                      .rdata            (imask1_rdata[63:0]),
                      .err              (imask1_err),
                      .rasr             (rasr),
                      // Inputs
                      .clk              (clk),
                      .sel              (imask1_sel_reg_int),
                      .rd               (rd_int),
                      .rd_data          (rd_data[63:0]),
                      .non_qualified_addr_err(non_qualified_addr_err));


always @ (/*AUTOSENSE*/addr_int or ldf_mask64 or ldf_mask65 or ldf_mask66
          or ldf_mask67 or ldf_mask68 or wr_en)
  begin
                  non_qualified_addr_err = 0;
                  rd_data            = 64'hdead_beef_dead_beef;

                  ld_ldf_mask64      = 0;
                  ld_ldf_mask65      = 0;
                  ld_ldf_mask66      = 0;
                  ld_ldf_mask67      = 0;
                  ld_ldf_mask68      = 0;

    case({addr_int[18:3],3'b0}) //synopsys parallel_case full_case
    19'h0_0000: begin
                  ld_ldf_mask64      = wr_en;
                  rd_data            = {62'b0,ldf_mask64};
                end
    19'h0_2000: begin
                  ld_ldf_mask65      = wr_en;
                  rd_data            = {62'b0,ldf_mask65};
                end
    19'h0_4000: begin
                  ld_ldf_mask66      = wr_en;
                  rd_data            = {62'b0,ldf_mask66};
                end
    19'h0_6000: begin
                  ld_ldf_mask67      = wr_en;
                  rd_data            = {62'b0,ldf_mask67};
                end
    19'h0_8000: begin
                  ld_ldf_mask68      = wr_en;
                  rd_data            = {62'b0,ldf_mask68};
                end

    default:    begin
                  rd_data            = 64'hdead_beef_dead_beef;
                  non_qualified_addr_err = 1;
                end   // case: default
    endcase // case({addr[18:3],3'b0})
  end // always @ (...


endmodule // niu_pio_imask1_decoder